Comprehensive mining technology of drowned well

A water-flooded well and process technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve the problems of formation seepage capacity decline, low cement bond strength, unsatisfactory oil production, etc., to achieve Prolong the oil production period, improve the effect of water shutoff, and the effect of smooth pressure drop funnel

Inactive Publication Date: 2012-11-07
XINJIANG HUAYOU TECH SERVICE
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AI Technical Summary

Problems solved by technology

During the oil production process of the oil well, due to the reduction of pressure and temperature, wax deposition and asphaltene precipitation and formation water scaling will occur in the formation near the wellbore. In addition, the solid phase particles in the formation will migrate with the liquid flow to form pore blockage, which will reduce the seepage capacity of the formation. Decrease, but also lower the cement bond strength, therefore, the outflow of fluid after plugging has becom

Method used

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Examples

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Example Embodiment

[0027] Example 1

[0028] Xinjiang Honglian Oilfield has active bottom water, long mining time, large bottom water coning, and great difficulty in plugging water. However, there is still potential for oil production at the top of the reservoir, and the production capacity of the oil well can be restored to a certain extent after water plugging measures.

[0029] A comprehensive mining process is adopted for the flooded wells in this oilfield, and the steps are as follows:

[0030] 1. Use plugging solution to remove plugging of the formation, specifically: first use hydrocarbon surfactant, fluorocarbon surfactant and wax dissolving agent in a weight ratio of 3.0:0.5:1.0 to pretreat the formation to relieve the wellbore The organic matter in the pores of the nearby formation is pretreated with retarded acid to remove the inorganic matter in the pores of the formation near the wellbore. Thereby, the liquid flow channel is dredged, the rock surface is cleaned, and the water blo...

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PUM

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Abstract

The invention discloses a comprehensive mining technology of a drowned well, comprising the step 1: stratum unblocking pretreatment prior to water plugging; step 2: shallow plugging; step 3: deep plugging adjustment; and step 4: hydraulic deep penetration perforating and oil production recovery of an oil well. According to the characteristics of the drowned well, multiple mature technologies are organically comprehensively applied, with the combination of first dredging and subsequent plugging, the problem that no oil is produced after plugging is effectively solved. By first shallow plugging and subsequent deep plugging adjustment and in combination with hydraulic deep penetration perforating, the period of validity of mining is effectively prolonged and the input-output ratio is improved.

Description

technical field [0001] The invention relates to an oil well exploitation technique, in particular to a water flooded well exploitation technique. Background technique [0002] At present, most oilfields in my country have entered the medium-high water-cut period, and after entering the high-water-cut period, the decline in oil production will accelerate. In these high water-cut oilfields, bottom water reservoirs account for a huge number and have abundant reserves. Bottom water reservoirs have thick reservoirs, large water bodies, and abundant natural energy. The most prominent problem in development is how to prevent and restrain bottom water coning. [0003] The practical experience of oilfields at home and abroad shows that the key technology for the development of bottom water reservoirs is to suppress water coning or control bottom water coning, prolong the water-free oil recovery period of oil wells to the greatest extent and control the uniform displacement of bottom...

Claims

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Application Information

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IPC IPC(8): E21B43/22
Inventor 朱全厚
Owner XINJIANG HUAYOU TECH SERVICE
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